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Heat Pump Hot Water System vs Gas Hot Water

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coppice:

--- Quote from: kaz911 on December 02, 2022, 10:04:09 am ---
--- Quote from: coppice on December 01, 2022, 09:35:47 pm ---
I said don't circulate warm water. The UK seems locked into the idea of warm water to heat homes. Its will come back to bite you if we have warmer summers, and you can't use that heat pump for effective cooling. If you use the heat pump to gently warm and cool air, and duct that around the house, you can keep a pretty good COP through an entire UK year. Making good use of heat pumps is about minimising the temperature gradients. You can't just heat air to 20C and just pass that around the house, and get the house to 20C. The air needs to be a bit warmer, but not much. Certainly not the 50C to 60C you need to make radiators viable. I keep seeing people talk like there is a deep connection between good insulation and heat pumps. There isn't. Insulation bring the same benefits in cost reduction and more consistent temperatures from wall to wall however you heat your home.

--- End quote ---

having lived in both very hot and and very cold countries with a huge mix of heating and cooling systems - I will say I do by far prefer heat from indirect sources (like UFH or radiators) - UFH is the preference by a MILE.

Hot air heat is ok - but it has a tendency to dry out everything - skin gets dry - eyes get dry and itchy etc.  I had a unit in my old office that replaced my resistive storage heaters - and that even had a humidification option built in.

Cool air-condition has some of the same issues - but you get nothing but problems if you try to reverse water based UFH to UF cooling - as hot countries often are humid - and cold surface in humid conditions creates liquid water.

--- End quote ---
I've also lived in both hot and cold, dry and super humid places. Forced air heating varies a lot. If they just blast air at a high temperature it can work OK, but if they blast slightly warm air they cause too much evaporation from the skin, and things feel cold. Well designed systems, like Daikin, allow for this very well. In cooling mode they blast out the air. In warming mode they are much more subdued, adapting to avoid too much of that cooling effect. Keeping the circulators well away from the people (e.g. high up on the least used side of the room) helps, too. I heated and cooled my last home with Daikin split air-cons, and the in room air circulators were very pleasant, and made very little noise.There are options which make the air circulators bigger and slower, which are extremely hard to hear, unless you are very close. These things are very efficient.

Marco:

--- Quote from: kaz911 on December 02, 2022, 10:04:09 am ---having lived in both very hot and and very cold countries with a huge mix of heating and cooling systems - I will say I do by far prefer heat from indirect sources (like UFH or radiators) - UFH is the preference by a MILE.

--- End quote ---

Unless you have and want extremely expensive flooring, ripping up a floor for a room and putting in a dry build floor heating system isn't big or expensive job, you can just lay a floating floor straight on top. If the gas prices persist, or you're still there in a couple decades putting UFH in just in the living room and FCUs everywhere else seems a good option, which should cost a lot less than 100k.

EEVblog:
Update:

BrianHG:
Here is a nice short docu/explanation on an electric hot water tank's dual heating element function while in use, filmed with an infrared camera.
It's explained and photographed why the hot water doesn't mix with the new cold water coming in.

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